This is a natural nylon knurled head screw without a flange. This is fully threaded and has a 19.5mm diameter flat knurled head. This screw can be tightened without tools.
This screw is also available in polypropylene, polyethylene, polycarbonate, FDV-filled nylon or polyvinylidene fluoride.
It does not conduct electricity. For the majority of screws there is an integral thread up to 80mm.